Portion of a shoe upper



FIG. 1 is a front perspective view of a portion of a shoe upper showing my new design;

FIG. 2 is a rear perspective view thereof; and,

FIG. 3 is a side view thereof.

The broken lines immediately adjacent to the shaded area represent unclaimed boundaries of the design. The broken line showing of the remainder of the shoe is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a shoe upper, as shown and described. 